package com.changgou.web.gateway.filter;

import com.changgou.web.gateway.service.AuthorizeService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    private static final String LOGIN_URL = "http://localhost:8001/api/oauth/toLogin";
    @Autowired
    private AuthorizeService authorizeService;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取请求响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //1.根据请求路径判断用户是否是登录操作,登录就放行
        String path = request.getURI().getPath();
        if (!UrlFilter.hasAuthorize(path)){
            return chain.filter(exchange);
        }
        //2.判断请求域中的cookie是否有jti,没有则拒绝访问
        String jti = authorizeService.getJtiFromCookie(request);
        if (StringUtils.isEmpty(jti)){
            //拒绝访问,请求跳转
            /*response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();*/
            return this.toLoginPage(LOGIN_URL + "?FROM=" + request.getURI().getPath(),exchange);
        }
        //3.判断redis中是否有token令牌,没有则拒绝访问
        String jwt = authorizeService.getJwtFromRedis(jti);
        if (StringUtils.isEmpty(jwt)){
            //拒绝访问,请求跳转
            /*response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();*/
            return this.toLoginPage(LOGIN_URL + "?FROM=" + request.getURI().getPath(),exchange);
        }
        //4.校验通过,请求头增强,放行
        request.mutate().header("Authorization","Bearer "+jwt);
        return chain.filter(exchange);
    }

    private Mono<Void> toLoginPage(String loginUrl, ServerWebExchange exchange) {
        final ServerHttpResponse response = exchange.getResponse();
        response.setStatusCode(HttpStatus.SEE_OTHER);
        response.getHeaders().set("Location",loginUrl);
        return response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
